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Why is my Environmental Management System (AP9320) displaying a critical alarm even though there are no individual alarms or connected devices?

Issue

Environmental Management System (EMS) displaying a critical alarm even though there are no individual alarms or connected devices

Product Line

Environmental Monitoring

Environmental Management System (EMS) - AP9320

Environment

All firmware versions

All serial numbers

Cause

The EMS may display a critical fault if the A-Link terminators are left connected. The sensor circuit in the EMS is designed to detect when an inappropriate load is connected to the A-Link port. The EMS protects the load by displaying the alarm and limiting current output.

The current series of terminators cause this alarm to be displayed. The terminators are not required for the EMS to operate unless A-link devices are used. Removal will not prevent normal operation or harm the EMS in any way.

Resolution

Removal of the terminators from the EMS A-Link ports will resolve the issue.